package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomerException;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.pojo.Category;
import com.itheima.reggie.pojo.Dish;
import com.itheima.reggie.pojo.Setmeal;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    DishService dishService;

    @Autowired
    SetmealService setmealService;

    //1.扩展方法，删除分类，检查菜品、套餐的关联关系
    @Override
    public void deleteById(Long id) {
        //1.根据分类查询菜品: select * from dish where category_id = ?
        Integer count1 = dishService.lambdaQuery()
            .eq(Dish::getCategoryId, id)
            .count();
        if(count1 > 0){
            //让代码结束(停止)，抛出异常
            throw new CustomerException("该分类无法删除，有【菜品】关联");
        }

        //2.根据分类id查套餐: select * from setmeal where category_id = ?
        Integer count2 = setmealService.lambdaQuery()
            .eq(Setmeal::getCategoryId, id)
            .count();
        if(count2 > 0) {
            throw new CustomerException("该分类无法删除，有【套餐】关联");
        }

        //3.根据分类id删除分类: delete from category where id = ?
        this.removeById(id);   //或者super.removeById(id);
    }
}
